This John Carter of Mars RPG bundle is a repeat from 2021. There haven't been any new products since. For $25 you get:

MUH-51392 John Carter of Mars: Adventures on the Dying World of Barsoom (2018)
MUH-51408 John Carter of Mars Narrator's Screen & Narrator's Kit (2018)
MUH-51424 John Carter of Mars Quickstart Rules and Adventure (2018)
MUH-51845 John Carter of Mars Legacy Map & Travel Guide (2020)

MUH-51537 Phantoms of Mars (2018) - 128-page campaign in 4 parts

MUH-51466 Dotar Sojat Era (2019) - 138-page alien Martians sourcebook
MUH-51467 Prince of Helium Era (2019) - 137-page human Martians sourcebook
MUH-51468 Jeddak of Jeddaks Era (2019) - 137-page sourcebook

MUH-51465 Landscape and Location Card Deck (2019) - 52-card deck
MUH-51545 Character and Token Card Deck (2019) - 52-card deck

Other items not included

John Carter of Mars Dice Set (2018)
John Carter of Mars Players Guide (2019) - subset of the core rulebook, no new material
MUH-51405 John Carter of Mars: Airships of Barsoom Tile Set (2019)
MUH-51406 John Carter of Mars: Ruins of Korad Tile Set (2019) - both tile sets included miniatures

Back in 2021 I was not interested since there was only the one campaign. That's still the case but now it's like this is a dead line so it's like buying a complete line. I'm inclined to buy.

2024-03-31: I bought the collection. Turns out the card decks are just pictures (with card backs for characters and descriptions for locations). I guess maybe useful for randomly choosing a notable character that makes an appearance or a location of significance for the adventure. Also the books are a bit more landscape oriented so not as much text per page as normal.